When the temperatures drop below 40ºF all outdoor cooking devices run cooler. I've seen it with my gas a charcoal grills and have to assume the same would occur with an electric smoker. The appliances aren't insulated and cool off quickly. I'd bet an electric smoker has limited ability to maintain heat. Does the instruction manual address this?

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"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan